Melanotaenium endogenum

Melanotaenium endogenum (Unger) de Bary, 1874

on Galium

gall

sori as lead-coloured warts in rows along the lower internodes of the stem; often they are so numerous that the internodium seems generally swollen; spores are formed in the host tissue, the black spore mass therefore is agglutinated, not powdery. Infected plants do not flower.